Man died via internal decapitation off of a safe back drop. There's no way he didn't know his neck was obliterated. There's not a doctor in the world who could have looked at him and cleared him. Dude probably should have been in bed the rest of his life much less still workingCreepily enough, that letter was purportedly written right around the time he body really started to fail him. He hadn't been looking great at all basically from 2007 onward.
Wouldn't surprise me if the thought hadn't crossed his mind around that time.
Misawa, one of the true GOATS, spent his last couple of years thinking tonight might be the night and going back to the hotel to play his Gameboy Advance when he didn't die in the ring.